Pressure-gage.



( 8 Patented June 15, 1915.

WITNESSES: IQ VVENTOR.

J. A. WESENER.

PRESSURE GAGE.

APPHCATION FILED MAY 2. 1914.

, I BY ii/.77. I I ZZZNEYS,

phragm type wher 301m a. wnsnmm, or omen, minors.

PRESSURE-GAGE. 7

Specification of Letters Patent.

Patented June 15, 1915.

I 1 application filed March 6, 1918, Serial No. 752,400. Divided andthis application filed may 2, 1914.

'To all whom z'tmay concern Be it known that 1, JOHN A. Wesnnnn, acitizen of the United States, residm at Chicago, in the county of Cookand tide of Illinois, have invented certain new and useful Improvementsin Pressure-Gages, of which the following is a specification.

My invention relates to pressure gages m which the indicating mechanismis actuated by flexible diaphragm; and the invention has for its primaryobject to provide a pressure gage of this typehaving certain novelconstructions and arrangements whereby it may be employed for indicatingthe pressure of a gas used for the maturing and bleaching of flour, suchas chlorin, nitrosyl chlorid, or other gas having similar properties;the gage bem primarily intende to form a part of a our treatingapparatussuch as that disclosed in my co-pen application Serial No. 7 52,400filed March 6, 1913. The gases used for the maturing and bleaching offlour, such as chlorin, nitrosyl chlorid or a mixture of these gases,arevery corrosive in their action upon some metals,

for'example,.on steel, under certain condltions which cannot be alwayswholly controlled, for instance, ifthere is any appreciable amount ofmoisture in the gas. This makes the ordinary flexible diaphragm gageunsuitable for use in flour treating apparatus. On the other hand, it isessential to the proper treatment of the flour that the amount of thegas be accurately controlled which necessitates a mechanism forindicating the pressure in the will be very accurate, rehable andsensitiye in its operation. This is particularly so inasmuch as thepressures handled are comparatively low.

I have overcome the difliculty involved by certain novel improvements inthe construction of a pressure ggge of the flexible diay the steeldiaphragm which actuates the indicating mechanism is protected fromcontact with the gas without, however, impairing the sensitiveness ofthe device to minute changes in pressure.

This application is a division of my application Serial No. 752,400.above re erred to.

The invention is illustrated, in a preferred embodiment, in theaccompanying drawing wherein- Figure 1 is a longitudinal sectional viewas conduit which Serial no. ace.

of the device, the section passing through the dial casing back of thedial, Fig. 2, a view, in perspective, of the abutment disk showing theconnection of the pointer operating rod therewith, and Fig. 3, aninverted plan view of the disk.

Like characters of reference indicate like parts in the several figuresof the drawing.

Referrin to the drawing, 10 designates the dial 0 the gage, the back ofwhich is shown in Fig. 1, 11 the indicating hand or pointer, 12 a coiledspring. which moves the hand toward zero mark as the pressure decreases,13 a gear wheel on the spindle 14 of the two casing elements 19 and 20secured together by screws 21, the margin of the dlaphragm 18intervening between the upper casin 19 and the lower casing 20. Toprotect t e steel diaphragm 18 from the corrosive action of the gas inthe pressure chamber constituted by the lower casing element 20, whichis secured to the gas supply plpe of the treating apparatus at any suitable point, I provide a linin element or protecting diaphragm 22 preerably made of silver or lead which is arranged on the lmder side of andin intimate contact with the diaphragm 18 and conforms to the contourthereof in all respects.

Although the protective diaphragm is made as thin as possible itnecessarily makes the steel actuating diaphragm 18 more slug- 'sh andinsensitive than it would otherwise e. To compensate forthis a spring 23is interposed between the abutment disk 24 which rests on the top of thediaphragm 18 and a nut 25 in the upper end of casing 19. The pressure ofthe spring may be varied by an adjustment of the nut 25. The lowersurface of the abutment plate 24 is concentrically corrugated so as tofit the corrugations of the diaphragm. It is connected with the arm 16of sector gear 15 by means oi a twe-part telescopic connecting rod, thelower section 26' of which is pivoted to a clevis 2? on the. abutmentplate, the upper I Preferably section 28 being adjustably fixed in thelower section by means of a set screw 29. the lower diaphragm casingsection 20 is provided with a lining 30.

The above described arrangements provide a pressure gage which may beused without impairment of its intended function with aver-y corrosivegas and which is nevertheless extremely sensitive to slight variationsinpressure of such gas. The derice is also readily adjustable.

claim:

' 1. In a. pressure gage, the combination with indicating mechanism, ofa diaphragm casing,- a flexible pressure operated actuating diaphragmfor said indicating mechanism which extends across said casing, and aprotective diaphragm of non-corrosible material in-intimate contact withsaid flexible diaphragm on theipressure side of: the

' same and having the contour thereof.

- pressure side thereof, and

p 2. In a pressure gage the combination with indicating mechanism, of adiaphragm provided with a spring abutment, a flexible pressure operatedactuating diaphragm for said indicating "mechanism which extends acrosssaid casing, a protective diaphragm of non-corrosible material inintimate contact with said flexible diaphragm on the a. springinterposed between the otherside of sai flexible diaphragm and saidspring abutment.

In a pressure gage, the combination with indicating mechanism, of adiaphragm casing, a flexible pressure operated actuating diaphragm forsaid indicating mechanism which extends across said casing, a protectivediaphragm of non-corrosible material in intimate contact with saidflexible diaphragm on the pressure side thereof, an adjustable springabutment, and a s ring interposed between said abutment an the flexiblediaphragm on the'side of the same opposite'the protective diaphragm.

4. In a pressure gage, ,the combination lead or silver its centralpresse with indicating mechanism, of a diaphragm casing, aconcentrically corru ated steel diaphragm extending across sai casing,an abutment disk having a concentrically "corrugated. surface bearingupon diaphragm; a connecting rod pivoted to said abutment disk andengagediwith said indicating mechanism, ing a threaded engagement withthe diaphragm casing, and a-perforation through which said operating rodpasses, a spiral spring bearin atone end against said abutment and atthe other against said disk, and a protective diaphragm ofnon-cbrrosible material .in intimate contact with the steel diaphragm onthepressure side of the same and having the contour thereof '5. Apressure phragm having its margin restrained and ortion free tomoveunder the influence o fluid pressure 'actin against one side thereof, aspring norma y maintaining atension upon the other side of the diaphra adevice for indicating variations 0 pressure, operatively connected tosaid indicating'd'eviceand having one end loosely engaging saiddiaphragm upon the side of the tension member, and means for adjustingthe. tension of said spring independently of said actuating member.

7 6. A pressure gage comprising a housing, a diaphragm within thehousing and having its marginal rim clamped therein, a bearin block'carried by said dia hra an ad ustable spring engaging sai block, meansfor adjusting the tension of said spring. an indicating device, and aspringstem or rod operatively connected with said indicating device andhaving one end bearing loosely upon said bearing block.

' JOHN A. WESE NER. Witnesses:

L. AIFALKENBERG,

. KIN NER.

a spring abutment hav-' an actuating member said steel gage comprising adi l

